CVE-2021-33766

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-33766
Microsoft Exchange Server Information Disclosure Vulnerability

7.3 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 3.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact LOW

Scope UNCHANGED

5.0 /10

CVSS v2.0 : MEDIUM

V2 Legend

Vector : AV:N/AC:L/Au:N/C:P/I:N/A:N

Exploitability : 10.0 / Impact : 2.9

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact NONE

Availability Impact NONE

References
Link Resource
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33766 Patch Vendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-798/ Third Party Advisory VDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33766 Patch Vendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-798/ Third Party Advisory VDB Entry
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-33766 US Government Resource
Configurations

Configuration 1 (hide)

OR cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_23:*:*:*:*:*:*
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_19:*:*:*:*:*:*
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_20:*:*:*:*:*:*
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_8:*:*:*:*:*:*
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_9:*:*:*:*:*:*
History

29 Oct 2025, 16:47

Type Values Removed Values Added
References () https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-33766 - () https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-33766 - US Government Resource

22 Oct 2025, 00:17

Type Values Removed Values Added
References
  • () https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-33766 -

21 Oct 2025, 20:18

Type Values Removed Values Added
References
  • {'url': 'https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-33766', 'source': '134c704f-9b21-4f2e-91b3-4a467353bcc0'}

21 Oct 2025, 19:19

Type Values Removed Values Added
References
  • () https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-33766 -

07 Mar 2025, 21:54

Type Values Removed Values Added
CWE CWE-287 NVD-CWE-noinfo

21 Nov 2024, 06:09

Type Values Removed Values Added
References () https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33766 - Patch, Vendor Advisory () https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33766 - Patch, Vendor Advisory
References () https://www.zerodayinitiative.com/advisories/ZDI-21-798/ - Third Party Advisory, VDB Entry () https://www.zerodayinitiative.com/advisories/ZDI-21-798/ - Third Party Advisory, VDB Entry

28 Dec 2023, 23:15

Type Values Removed Values Added
Summary Microsoft Exchange Information Disclosure Vulnerability Microsoft Exchange Server Information Disclosure Vulnerability
CVSS v2 : 5.0
v3 : 7.5 		v2 : 5.0
v3 : 7.3
Information

Published : 2021-07-14 18:15

Updated : 2025-10-29 16:47

NVD link : CVE-2021-33766

Mitre link : CVE-2021-33766

CVE.ORG link : CVE-2021-33766

JSON object : View

Products Affected

microsoft

  • exchange_server
CWE
NVD-CWE-noinfo